difference between phase difference and path difference?Watch
Phase difference is to do with whether the waves are at a peak or trough (or any where in between) and is often expressed as an angle, with 180 degrees being out of phase (peak meets trough)
I find this helps (better explanation than mine): https://www.youtube.com/watch?v=j1ULNWZ3Xh4 hope that helps
Path difference refers to a physical length, phase difference is dimensionless. If two waves have a phase difference of but have the same wavelength, their path difference is
That is not wrong but I don't think you could say that was the difference as it would be like saying the difference between distance and time is that one is measured in metres and one in seconds. They are measurement of completely different things/
wait but don't they both measure the length of one wave compared to another?
Not really, I would describe Phase difference as the difference between to waves in their cycle. Whereas, Path difference is a measure of difference in how far they have travelled in terms in their wavelength. https://www.youtube.com/watch?v=j1ULNWZ3Xh4 honestly watch this video, it has diagrams which I can't explain in text. Hope that helps
There’s 2 waves, wave X and wave Y,with the same wavelength of 5m. Wave X is 2m ahead of wave Y.
The path difference is 2m.
The phase difference is 2/5*2pi